What Gebrüder Dorfner does

Gebrüder Dorfner GmbH & Co. KG, founded in 1895 and headquartered in Hirschau, Germany, is a privately held family-owned manufacturer specializing in the extraction, refinement, and application of industrial minerals and functional filler systems. The company operates from one of Germany's most important kaolin and quartz deposits and supplies manufacturers across paints and coatings, construction chemicals, industrial flooring, quartz composites (kitchen sinks and worktops), ceramics, glass, paper, and traditional industries. Branded product lines include calcined kaolins, GRANUCOL® colored fillers (including GRANUCOL® CONDUCT for ESD flooring), DORSIMIX® and DORSICOAT® high-performance quartz fillers for industrial floors, MELADUR®/DORSIDUR® hard aggregates for hydraulic floors, DORKACOM® 50 and DORKAPUR® 100 metakaolins for CO2-reduced concrete, and the overarching REFINERALS® brand.

The company's technology stack combines proprietary calcination and high-tech particle modification processes with an AI-driven formulation platform built on Citrine Informatics, which models functional properties, costs, and energy consumption of kaolin processing variants and reportedly reduced new formulation development time by 84%. The company holds patents covering quartz composite kitchen sink filler technology and operates with TÜV-certified ISO 9001, ISO 14001, and ISO 50001 management systems. Recognitions include the 2025 Capital Magazine "Best of AI" award and the 2026 EcoVadis Silver Medal for sustainability.

Dorfner runs a B2B industrial minerals business model with quote-based pricing on bulk specialty filler products, complemented by application technology services and development partnerships that take customers from formulation concept through market launch. Distribution is executed through a combination of direct sales from the German headquarters, wholly-owned subsidiaries in the USA (Dorfner USA / ACS International Products, L.P.) and Poland (Dorfner Minerals Polska), and a global network of more than 30 international trading partners. A 2021 joint venture with India's 20 Microns covers color sand distribution across India and additional Asian and African markets. Customers include named enterprises such as Remmers, Knauf, Nachtmann, Siemens Energy, Sika, and Elleci.

Name

Gebrüder Dorfner

Legal name

Gebrüder Dorfner GmbH & Co. KG

Website

https://dorfner.com

Company type

Private

Founded year

1895

Operating status

Operating

Headcount range

51–100 employees

Short description

Gebrüder Dorfner is a 130-year-old, family-owned German manufacturer of industrial minerals and functional fillers (kaolin, quartz, metakaolin), supplying B2B customers across paints/coatings, construction, composites, ceramics, glass, and paper industries via direct sales and a global dealer network.

Ownership category

akta.pro rank

Product category

Industrial Minerals and Functional Fillers

NAICS

Kaolin, Clay, and Ceramic and Refractory Minerals Mining (212323), Ground or Treated Mineral and Earth Manufacturing (327992)

SIC

Industrial Inorganic Chemicals (2810), Abrasive, Asbestos & Misc Nonmetallic Mineral Prods (3290)

akta.pro primary industry

Kaolin & Ball Clay (IMAEAFAB)

akta.pro secondary industries

Kaolin & Industrial Clay Mining (Bentonite, Ball Clay, Fuller’s Earth) (IMAKAGAJ), Mineral/Particulate Thickeners (Silicates, Clays, Calcium Carbonate as texturizers) (AFAJAMAJ)

Keywords

• Industrial minerals processing
• Functional fillers manufacturing
• Calcined kaolin production
• Quartz composite fillers
• Metakaolin cement replacement

Headquarters

HQ city

Hirschau

HQ country

Germany

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Technology or R&D, Personnel, Marketing or Sales, Infrastructure

Revenue model

1. Industrial Minerals and Functional Fillers: Manufacture and sale of refined industrial minerals including kaolin, quartz, metakaolin, and specialized functional filler systems (DORSIMIX, GRANUCOL, DORSICOAT). Products sold directly to manufacturers and through international dealer network. Revenue from product sales of raw and refined mineral materials.
2. Application Technology Services: Technical consulting and application technology services supporting customers from product development through production and market launch. Professional R&D support and formulation optimization services.

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

Gebrüder Dorfner extracts, refines, and processes industrial minerals (kaolin, quartz, metakaolin) from company-owned deposits in Hirschau, Germany, and manufactures high-functional filler systems for industrial customers. The company sells calcined kaolins, coated quartz products, colored and specialty fillers under brands such as GRANUCOL®, DORSIMIX®, DORSICOAT®, MELADUR®, DORSIDUR®, DORKACOM® and DORKAPUR®, serving manufacturers of paints and coatings, quartz composite kitchen sinks, industrial flooring, construction chemicals, paper, glass, and ceramics.

Product overview

Gebrüder Dorfner is a leading expert in the extraction, refinement, and application of industrial minerals and functional filler systems. The company operates with a platform approach, offering calcined kaolins (kalzinierte Kaoline) as core products alongside specialized branded filler lines including GRANUCOL® (colored fillers for composites and flooring, including CONDUCT variants for ESD protection), DORSIMIX® and DORSICOAT® (quartz-based fillers for industrial floors), MELADUR® and DORSIDUR® (hard aggregates for hydraulic floors), and DORKACOM® 50 and DORKAPUR® 100 (metakaolin products for CO2 reduction in construction). The REFINERALS® brand encompasses highly refined industrial minerals from their own deposits. Applications span coatings, composites (kitchen sinks and worktops), construction (flooring systems), and silicate raw materials for building materials, construction chemicals, paper, glass, and ceramics.

Differentiator

Problem solved

Functional benefit

Brands

• GRANUCOL: Functional colored fillers for quartz composites and engineered stone surfaces, including GRANUCOL CONDUCT (conductive fillers for ESD floor coatings)
• DORSIMIX
• DORSICOAT
• MELADUR
• DORSIDUR
• DORKACOM
• DORKAPUR
• DORKAFILL
• REFINERALS

Products and services

• Calcined Kaolins (Kalzinierte Kaoline) High-quality calcined kaolin products that improve dispersion paints and lacquers, enhancing performance, efficiency, and finished results for coatings manufacturers.
• GRANUCOL® Functional Colored Fillers Color sands with polymer or ceramic coating, plus conductive variants, for decorative and engineered stone applications in quartz composite kitchen sinks, worktops, and composite materials.
• DORSIMIX® High-Performance Quartz Fillers High-performance quartz-based fillers for resin-bound industrial and commercial concrete floor systems requiring high filling degrees, reliable self-levelling, and easy processing.
• DORSICOAT® Dust-Reducing Fillers Dust-reducing fillers for resin-bound coatings that significantly reduce dust development during installation, ensuring a clean and safe working environment and compliance with EU occupational safety directives.
• MELADUR® Hard Aggregates Hard aggregates for monolithic hydraulic industrial floors engineered to withstand maximum loads in production areas, workshops, and chemical plants.
• DORSIDUR® Hard Aggregates Hard aggregates for hydraulically-bound industrial flooring systems providing excellent abrasion resistance, high compressive and flexural strength, and DIN-tested quality.
• DORKACOM® 50 Metakaolin Metakaolin that can replace up to 40% of conventional Portland cement, with a CO2 equivalent of 200 kg per ton, suitable for aesthetic concrete applications due to high whiteness.
• DORKAPUR® 100 Metakaolin High-quality metakaolin with CO2 equivalent of 350 kg per ton that reacts with calcium hydroxide and water to improve concrete strength and durability through formation of calcium silicate hydrate and calcium aluminum hydrate phases.
• Filter Sands (Filtersande) High-purity filter sands for highly sensitive drinking water treatment plants, offering high purity to prevent dissolution of undesirable substances and special properties to facilitate backwashing and long service life.
• REFINERALS® Refined Industrial Minerals Umbrella brand of highly refined industrial minerals produced from the company's own raw material deposits through innovative processing, serving numerous applications across multiple industries.

Quantifiable outcome

• New formulation development time reduced by 84% using AI platform
• +4 more outcomes

Named customers6 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability5 records

Feature9 records

Partnerships

Two partnerships are on record, tiered core.

• 20 MicronscoreStrategic or Co-development Partner · 1 January 2021Joint venture established in 2021 between Dorfner and 20 Microns for the development, marketing, and distribution of color sand products in India and further Asian and African markets. JV focuses on Indian color sand business for industrial applications, importing Hirschau products and sourcing local products from 20 Microns.
• Citrine InformaticscoreTechnology or IntegrationAI platform partnership for formulation modeling and optimization. Citrine's platform enables Dorfner to model functional properties, costs, and energy consumption of various potential materials from different kaolin processing and calcination processes. Achieved 84% reduction in new formulation development time.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Imerys: French global leader in mineral-based specialty solutions including calcined kaolin, functional fillers, and performance minerals for paints, coatings, plastics, and construction. Most direct large-scale competitor to Dorfner across virtually every kaolin/filler application.
• IMERYS Carbonates: Specialty ground calcium carbonate and functional mineral fillers for construction chemicals, flooring, and composites from Imerys. Closely comparable to Dorfner's DORSIMIX/DORSIDUR/MELADUR floor-aggregate portfolio.
• KaMin Performance Minerals: US-based kaolin miner and processor (part of CADENCE Performance Minerals) supplying hydrous and calcined kaolin to the paints, coatings, plastics, and adhesives industries. Directly competes with Dorfner in calcined kaolin and functional fillers.
• Thiele Kaolin Company: Kaolin mining and processing company producing hydrous, calcined, and engineered kaolin products for industrial customers in coatings, adhesives, and construction. Comparable product focus and B2B go-to-market to Dorfner.
• Sibelco: Belgian-headquartered global industrial minerals group producing silica, nepheline, feldspars, and kaolin for glass, ceramics, paints, and construction chemicals. Overlaps directly with Dorfner's quartz, kaolin, and functional filler portfolios across European and global markets.
• Quarzwerke GmbH: German family-owned industrial minerals competitor with a portfolio of fillers, sands, and silica-based functional additives for construction chemicals, paints, and composites. Closest home-market peer to Dorfner with overlapping products and customer segments.

Regional players

• SCR-Sibelco (now Sibelco) India / 20 Microns: Indian industrial minerals producer serving paints/coatings, plastics, and construction across South Asia. Dorfner's JV partner for color sands in India and additional Asia/Africa, but competes in overlapping regional markets.

Broad incumbents

• Mineral Technologies Inc. Public specialty minerals company (MTX) operating across performance materials, including processed kaolin and bentonite products for industrial and consumer applications. Broader incumbent operating in the same industrial mineral category as Dorfner.
• Evonik Industries: German specialty chemicals group whose Silica business supplies precipitated silica, matting agents, and rheology modifiers used in coatings, adhesives, and composites. Adjacent functional filler competition for Dorfner in paints and coatings.
• BASF SE: World's largest chemical company with broad pigments and filler businesses (incl. kaolin-based and silica-based additives) for coatings, plastics, and construction. Overlaps with Dorfner's functional fillers but as part of a far larger, diversified chemical portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/gebr%C3%BCder-dorfner-gmbh-co-kg/posts/?feedView=all

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Gebrüder Dorfner